New England Patriots defensive end Jermaine Cunningham was suspended four games for violating the NFL's performance-enhancing substances policy. The league announced the suspension Monday, but did not reveal which substance Cunningham is accused of using. Cunningham can return to the team's roster on Dec. 24 but will not be able to play the Patriots' regular-season finale against the Miami Dolphins on Dec. 30. Cunningham has 23 tackles and 2.5 sacks in 11 games this season. Starter Chandler Jones has been out since injuring an ankle Nov. 11. Trevor Scott is listed next on the team's depth chart. Running back Brandon Bolden was suspended four games earlier this season for violating the league's performance-enhancing drugs policy. He is eligible to return next week.